Auto surges forward when started
Thread Starter
Drifting
Joined: Sep 2022
Posts: 1,784
Likes: 2,028
From: In the woods
2024 C5of the Year Finalist - Unmodified
Auto surges forward when started
I have noticed when starting up after a few days sitting or when cold my 2K auto will surge forward a bit on initial start, as if the clutches are somewhat engaged. The trans has 124,000 and as far as I know it is untouched. I have no experience with a 4L60, is this a trait of this trans or something more devious? TIA
Thread Starter
Drifting
Joined: Sep 2022
Posts: 1,784
Likes: 2,028
From: In the woods
2024 C5of the Year Finalist - Unmodified
Not worried about it getting away, just curious. Like others mentioned it is just a small movement. Must be a GM thing, I bought a 2024 Malibu new yesterday and it does it as well. The lever actuated parking brake is only good for getting the rear end to come around in the snow when the front's start understeering...
Burning Brakes
Joined: Jun 2022
Posts: 751
Likes: 362
You have gotten a lot of life from the 4l60e lol
If your in park and surging forward and converter was locked I’d imagine you would stall like a 6 speed would.
I’m not a transmission guy so take my comments as such. Could be as simple as a fluid filter service or maybe a servo that is easy to access at the same time.
Could be a failing converter or transmission that needs replaced. If that’s the case then the transmission is coming out. Refresh the transmission if it comes out. That’s and a Re manufactured converter should be around $600 not including labor to pull the transmission and reinstall.
Pulling and reinstalling is a whole different conversation.
If your in park and surging forward and converter was locked I’d imagine you would stall like a 6 speed would.
I’m not a transmission guy so take my comments as such. Could be as simple as a fluid filter service or maybe a servo that is easy to access at the same time.
Could be a failing converter or transmission that needs replaced. If that’s the case then the transmission is coming out. Refresh the transmission if it comes out. That’s and a Re manufactured converter should be around $600 not including labor to pull the transmission and reinstall.
Pulling and reinstalling is a whole different conversation.
Drifting
Joined: Sep 2009
Posts: 1,862
Likes: 594
From: Prescott, Arizona
If the transmission has had the same fluid and filter for 124,000 miles it is time for a fluid and filter change. My A4 has 120,000 miles, 28 days on road course race tracks and approximately 10,000 wide open throttle upshifts from 2nd to 3rd on it. But I have changed fluid and filter five times and only use Red Line full synthetic fluid. The car does not move at startup.
